I just found this on fanfiction.net and thought it was excellent. It's a WIP, but the first three chapters are fabulous. Chloe makes a deadly deal with Lex. The story takes place during Season 6 and I am really enjoying both the Lex and Chloe characterizations. Lex is sinister and evil and Chloe is determined and smart. Even if you're not a fan of Chlex, this is worth checking out.
Collaborator by Panache